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Consolidated Statements of Operations (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 151 Months Ended | 160 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Sep. 30, 2013
Statements Of Operations [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Operating expenses: |  |  |  |  |  |  |  |
Research and development, net of reimbursements | 778,232 | 1,677,301 | 2,373,200 | 2,723,459 | 3,440,485 | 323,788 | 26,420,519 | 28,793,719
General and administrative | 830,730 | 722,037 | 2,730,233 | 1,520,221 | 4,506,232 | 2,959,246 | 24,504,975 | 27,235,208
Depreciation and amortization expense |  | 112 |  | 429 | 581 | 633 | 3,262,462 | 3,262,462
Loss on disposition of equipment |  |  | 4,122 |  |  |  | 550,186 | 554,308
Total operating expenses | 1,608,962 | 2,399,450 | 5,107,555 | 4,244,109 | 7,947,298 | 3,283,667 | 54,738,142 | 59,845,697
Loss from operations | (1,608,962) | (2,399,450) | (5,107,555) | (4,244,109) | (7,947,298) | (3,283,667) | (54,738,142) | (59,845,697)
Other income (expense): |  |  |  |  |  |  |  |
Interest expense | (1,299) | (318,623) | (2,508) | (952,241) | 1,099,327 | 175,094 | 1,964,707 | (1,967,215)
Gain on extinguishment of liability |  |  |  |  |  |  | 260,000 | 260,000
Change in fair value - derivative liabilities | 189,348 | (294,381) | 216,112 | (287,604) | (685,420) | (13,966) | (699,386) | 915,498
Total other income (expense) | 188,049 | (613,004) | 213,604 | (1,239,845) | 413,907 | 161,128 | 1,005,321 | (791,717)
Net loss | $ (1,420,913) | $ (3,012,454) | $ (4,893,951) | $ (5,483,954) | $ (8,361,205) | $ (3,444,795) | $ (55,743,463) | $ (60,637,414)
Net loss per common share - basic and diluted | $ (0.06) | $ (3.76) | $ (0.22) | $ (6.84) | $ (7.58) | $ (4.30) |  |
Weighted average number of common shares outstanding - basic and diluted | 23,601,895 | 801,799 | 22,401,711 | 801,799 | 1,103,521 | 801,799 |  |

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